The first thing I do is take a reading of the light source with my Expodisc and make that my custom white balance.If you don't have an Expodisc you can try the Kelvin settings. Lower numbers produce less red. If I still need some minor adjustment then I use the WB shift feature in the menu of the camera. It allows movement in two separate axis. Blue/amber and green/magenta. If I still manage to shoot with a color problem I just use Color Balance in PS to correct it after first setting the proper white and black points with Levels. If I have a whole bunch of images I write an action that automates the process.